Make lgbm large actually large, rename load_rf_lgbm

[Pavel Zwerschke (pavelzw)]

This contains fixes from #15.

[github-actions]

(benchmark 4467498829 / attempt 1)
Base results / Our results / Change

Model	Size	Dump Time	Load Time
sklearn rf	77.2 MiB / 11.1 MiB / 6.94 x	0.07 s / 0.11 s / 1.56 x	0.08 s / 0.10 s / 1.25 x
sklearn rf LZMA	17.3 MiB / 5.3 MiB / 3.24 x	35.12 s / 5.81 s / 0.17 x	1.63 s / 0.57 s / 0.35 x
sklearn gb	2.2 MiB / 1.1 MiB / 2.08 x	0.03 s / 0.17 s / 5.89 x	0.03 s / 0.13 s / 3.89 x
sklearn gb LZMA	0.6 MiB / 0.2 MiB / 3.82 x	0.95 s / 0.37 s / 0.39 x	0.09 s / 0.15 s / 1.63 x
LGBM gbdt	5.3 MiB / 1.9 MiB / 2.81 x	0.17 s / 0.40 s / 2.40 x	0.03 s / 0.32 s / 12.94 x
LGBM gbdt LZMA	1.7 MiB / 0.8 MiB / 1.96 x	3.27 s / 0.99 s / 0.30 x	0.16 s / 0.39 s / 2.42 x
LGBM gbdt large	57.6 MiB / 18.9 MiB / 3.05 x	1.70 s / 4.10 s / 2.42 x	0.28 s / 3.33 s / 12.09 x
LGBM gbdt large LZMA	15.3 MiB / 6.7 MiB / 2.29 x	42.60 s / 12.58 s / 0.30 x	1.57 s / 4.14 s / 2.63 x
LGBM rf	1.6 MiB / 0.5 MiB / 3.42 x	0.05 s / 0.08 s / 1.82 x	0.01 s / 0.08 s / 13.81 x
LGBM rf LZMA	0.1 MiB / 0.1 MiB / 1.70 x	0.23 s / 0.12 s / 0.53 x	0.02 s / 0.09 s / 4.37 x